.header {
  box-shadow: 3px 0px 3px 0px #e3e4e5;
}
.header .trigger {
  float: left;
  color: #999;
  padding: 0 24px;
  font-size: 18px;
  line-height: 64px;
  cursor: pointer;
  transition: color 0.3s;
}
